[sdiy] Passive Ring Modulator

[Scott Gravenhorst]

Hmm.  I have the 1988 ARRL Handbook, I looked under diode, ring and 
through the whole 'modulator' section.  They have the single ring
schematic, but not the dual ring, at least not that I could find.  
The ARRL site http://www.arrl.org search didn't deliver much.  Maybe 
the 1988 printing got jipped.

ian <deviant at custard.org> wrote:
>Hi Steve & synth-diy
>sorry for the lack of replies - I've been off on a brief holiday.
>Anyway, I've been asked not to post the schematic of the dual diode ring
>ringmod here. But like I said, the circuit is in the Amateur Radio Relay
>League Handbook. There's nothing to stop someone else getting a copy from
>their website or maybe a library, and posting it here! Sorry about that...
>The reason for it is that the guy who gave me the ringmods has made a
>little kit for it and is considering selling it (I'll let you know if that
>happens). But I can tell you that the diodes have to be germanium (don't
>know what happens if they aren't!). The boxful of ringmods I have has a
>few different kinds (1N60A, 1N34A, 1N276, 1N541), and they all sound
>slightly different. You should obviously stick to the same diodes in one
>ringmod.
>Ian
>
>
>On Tue, 16 Jul 2002, Steve Begin wrote:
>
>> I remember I looked it up once before and I'm pretty sure I actually found
>> an equivalent diode, but I gave up when I couldn't find any reference to the
>> transformer they suggested. Now I can't seem to find the diode either.
>>
>> Ian: Sorry to be so much trouble, but could you tell what diode is being
>> used on your board as well?
>>
>> All the talk of fets and opamps is over my head (hopefully I'll catch on
>> eventually).  At this point I'd probably rather take the approach I'm most
>> likely to understand over the cleanest or easiest approach. :)
>>
>> Steve Begin
>>
>>
>>
>> -----Original Message-----
>> From: Terrence McWee [mailto:mcwee at m-net.arbornet.org]
>> Sent: Sunday, July 14, 2002 12:51 PM
>> To: ian
>> Cc: Steve Begin
>> Subject: Re: [sdiy] Passive Ring Modulator
>>
>>
>> Steve & Ian,
>>
>> I'm yet another dreadfully newbie SDIYer, so please bear with my dumb
>> questions.
>>
>> I'm getting pretty hyped up on this passive ring mod, and note that the
>> design calls for "Four (4) diodes GE45A or equivalent."  What,
>> precisely, constitutes a suitable equivalent to this?  I can't make
>> heads/tails of that ID number.
>>
>> Thanks,
>> T.M.
>>
>> On Friday, July 12, 2002, at 12:55  PM, ian wrote:
>>
>> > Hi Steve,
>> > I have a boxful of ringmods much like this sitting on my desk right
>> > now! I
>> > haven't had a chance to try them out yet, but other people who have
>> > tried
>> > them say they sound great. The design I have was given to me by a
>> > colleague, and it comes from the Amateur Radio Relay League handbook. It
>> > differs slightly from the one on sonicstate, as it has two diode rings,
>> > which is supposed to provide better carrier rejection than the single
>> > diode ring design. As for the transformers, the ringmods I have use one
>> > from Mouser, marked TL028 down one side and 0109S down the other.
>> > Ian
>> >
>> >
>> > On Fri, 12 Jul 2002, Steve Begin wrote:
>> >
>> >> Hi, I'm new to the list, not new to analog (am I gonna get in trouble
>> >> if I
>> >> spell it like that?)
>> >>  gear, but fairly inexperienced when it comes to circuitry.
>> >>
>> >> I've got a question, has anybody had any experience with a passive ring
>> >> modulator design like this one?
>> >> http://www.sonicstate.com/synthfool/ringmod.html
>> >>
>> >> I'm interested in it since it looks very easy to make and cheap and if
>> >> it
>> >> doesn't work as well as other designs it doesn't bother me that much.
>> >> However,  I guess the stancor a-4713 driver transformers are no longer
>> >> in
>> >> production and I can't seem to find anything information on them at
>> >> all, let
>> >> alone a reference to a part I could use as a substitute.
>> >> I'd really appreciate it if somebody could give me any direction at all
>> >> here.
>> >>
>> >> The other thing I was wondering about (and I'm sure it's probably
>> >> painfully
>> >> obvious to a lot of you) was half or full normalled patch bays.  When
>> >> you
>> >> split a signal doesn't it affect the impedance or something along those
>> >> lines?  I thought it would be a bad thing to do but I haven't seen
>> >> anybody
>> >> mention any problems with that.
>> >> How about combining signals without a mixer?  I'm almost positive you
>> >> get
>> >> problems doing that.
>> >>
>> >> Thanks!
>> >>
>> >>> Steve Begin
>> >>>
>> >>>
>> >>>
>> >>
>> >
>> >
>> *****     *****     *****
>>
>> Lindbergh baby.  Lindbergh, baby!
>>
>> Poor Mojo's Almanac(k)
>> http://www.poormojo.org
>>
>

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